what the hell is a nug i keep hearin people say it but i dunno what it means. im good on most other words its just this one i got trouble with.
1 Improper use of contact lenses or steroid eyedrops can lead to fungal infections, which in turn can cause corneal ulcers. Also, a corneal injury that results in plant material getting into the eye can lead to fungal keratitis.  Acanthamoeba are microscopic, single-celled amoeba that can cause human infection.
1 Bacterial infections cause corneal ulcers and are common in people who wear contact lenses. 2  Viral infections are also possible causes of corneal ulcers. 3  Such viruses include the herpes simplex virus (the virus that causes cold sores) or the varicella zoster virus (the virus that causes chickenpox and shingles).